DE60036462T2 - RIBBED POLYESTER FIBER AND FIBER STRUCTURE - Google Patents

Description

his technical field

These The invention relates to polyester fibers with three-dimensional crimping and a fiber structure using them, and more particularly she curled Polyester fiber with good carding behavior, the fluffy products with high compression resistance, such as nonwovens or Padding, can result and a fibrous structure comprising these crimped polyester fibers and by heat having connecting conjugated staple fibers.

Background of the invention

Polyester fibers, especially polyethylene terephthalate fibers have excellent properties mechanical strength and chemical and heat resistance or the like and be in great Scope for Applications such as clothing or industrial uses. The However, polyethylene terephthalate fibers themselves are flat and lacking to them on bulk. Various attempts to improve the Bauschigkeit were therefore used in applications such as the nonwovens or Padding, where a feeling the bulkiness is required by crimping the polyethylene terephthalate fibers made.

Even though the above from the ruffled Polyethylene terephthalate fibers produced the same the use show a high loft, there are the problems that it is longer continuous use easily to disappear the compression resistance comes.

In contrast, beats JP-A No. 11-189938 (1999) (JP-A Japanese Unexamined Patent Publication) means polytrimethylene terephthalate staple fibers having crimp in which the elastic elongation recovery rate, the flex recovery rate and the like are specified, and such staple fibers have improved as compared with the polyethylene terephthalate-having crimped fibers Compression resistance. However, these staple fibers are produced by a method of heat-treating the polytrimethylene terephthalate fibers, crimping with a stuffer-crimper, and cutting the crimped fibers into staple fibers, and there is the problem that the staple fibers have only flat, so-called two-dimensional crimp and the bulkiness of the staple fibers products obtained from these fibers is insufficient. Further suggests US 3,681,188 Fibers produced by imparting asymmetric birefringence across filament diameters by extruding polytrimethylene terephthalate filaments by asymmetric cooling and developing three-dimensional crimp. However, the crimped fibers obtained by the methods disclosed by the prior art have an extremely small number of crimps or an excessively high percentage of crimp, and there are problems that from such crimped fibers only products whose bulkiness is obtained or compression resistance is insufficient, and winding a tape around cylinders or rollers, waste fibers, belt breakage and the like occur in the carding step.

On the other hand, polyester staple fibers, particularly staple fibers based on polyethylene terephthalate (hereinafter sometimes abbreviated to PET) are widely used as wadding materials for bedding, furniture, clothes or the like. Above all, a fiber structure obtained by blending such polyester staple fibers with heat-bonding conjugate fibers and heat-treating the mixed fibers is used as a urethane substitute material for various applications such as padding materials, filling materials for futons, sheet materials for vehicles or bed mats. The PCT application WO 91/19032 . JP-A No. 4-240219 (1992) and the like propose fiber structures obtained by using the above heat-bonding conjugate fibers; however, there is a need for such a fiber structure with further improved compression resistance.

Disclosure of the invention

As a result of the extensive research carried out to solve the above problems, the inventors of the present invention et al. found that not only the carding performance is improved, but also the bulkiness and compression resistance of the resulting products are markedly improved when crimpy polyester fibers containing polytrimethylene terephthalate and having moderate three-dimensional crimp and high crimping elastic modulus are used, thereby achieving the present invention. Further, it has been found that bulkiness and compression resistance are markedly improved as compared with the conventionally proposed fiber structures when the above crimped polyester fibers are combined with heat-bonding conjugates th fibers are combined and a fiber structure is provided.

According to the present Invention are curled Polyester fibers proposed, which are characterized that they have a polytrimethylene terephthalate-based polyester and three-dimensional ripples with a number of ripples from 9 to 30 sheets / 25 mm and a crimp ratio of 20 to 50% and further a crimping elastic modulus of 80% or above have, and a fibrous structure, which is characterized in that they are staple fibers from the above crimped polyester fibers and by heat connecting conjugated staple fibers in a weight ratio of Staple fibers from the crimped Polyester fibers to those by heat connecting conjugated staple fibers from 30:70 to 95: 5 and by heat Affiliates has, at least partially, contact points the staple fibers from the crimped Polyester fibers with heat connecting conjugated staple fibers and / or at contact points by heat connecting conjugated staple fibers are formed with each other.

Best way of performing the invention

Of the polytrimethylene terephthalate-based polyesters described in the present invention is a polyester containing a trimethylene terephthalate unit primary having repeating unit, and may be a polyester, wherein a third component in an amount in an area that the present invention is not hindered, e.g. 15 mol% or less, preferably 5 mol% or less, based on an acid component, is copolymerized.

Various Species such as an acid component, e.g. isophthalic acid, Succinic acid, Adipic acid, 2,6-naphthalenedicarboxylic acid or a metal sulfoisophthalic acid, and a glycol component or the like, e.g. 1,4-butanediol, 1,6-hexanediol, cyclohexanediol or cyclohexanedimethanol can be used as the preferably used third components are used and can be used suitably by the spider property or the like considered becomes.

Various Additives, e.g. a matting agent, a heat stabilizer, a defoaming agent, an orthochromatic agent, a flame retardant, an antioxidant, a UV absorber, an IR absorber, an optical brightener or a Color pigment, can be added as needed.

In It is important to the present invention that not only the crimped Polyester fibers according to this Invention curled Are fibers containing the above polytrimethylene terephthalate-based polyester, but that the fibers also have three-dimensional crimp, which is the number of ripples and the crimp ratio like meet below and the crimping modulus at the same time meets the following requirements. With that you can Products with good carding and excellent bulk and compression resistance to be obtained.

The is called, the number of ripples the ruffled Polyester fibers according to this Invention must be 9 to 30 sheets / 25 mm and is more preferably 11 up to 20 sheets / 25 mm. If the number of crimps is less than 9 sheets / 25 mm, the bulkiness of the fibers obtained with these fibers is Products inadequate. On the other hand, if the number of crimps 30 sheets / 25 mm exceeds the entanglement property among the fibers becomes too high and that Carding behavior is worsened.

The Crimp ratio of Polyester fibers must be 20 to 50%, and more preferably 30 to 40%. When the crimp ratio is below 20% is the tangling property of the fibers among themselves low, the carding behavior is deteriorated, and it can not sufficient bulkiness can be obtained. On the other hand, if that Crimp ratio exceeds 50%, Not only is the entanglement property so high that entangling the Kardierverhalten deteriorates, but the resulting pile is also uneven.

Further, the crimp elastic modulus of the polyester fibers must be 80% or above, and more preferably 85% or above. When the curl elastic modulus is less than 80%, the carding performance is extremely deteriorated because the disappearance of the compressive resistance of the crimps is large and the fibers are easily wound around cylinders or rollers, so that many waste fibers are generated and band breakage and the like occur. As a result, the productivity is extremely lowered, and the bulkiness of the resulting products is insufficient. At the same time, the compression resistance of these products is greatly reduced. In particular, since the polytrimethylene terephthalate-based polyester fibers have a lower modulus and a lower crystallinity than polyethylene terephthalate fibers, the compression resistance of the crimps may disappear. Therefore, it is important to specify the crimping elastic modulus as described above.

In this invention can be improved carding, and the bulkiness and the compression resistance the products can be improved in the interaction of the above effects by taking care of it that will be the crimped Polyester fibers at the same time the requirements of the percentage the ripples, Crimp ratio and crimp modulus of elasticity as described above.

Further such effects are more pronounced by ripples, which are the three-dimensional ripple which is imparted to these polyester fibers. That's why sufficient Effects not with ripples obtained, the planar ripples which are by a method such as crimping with a Stauchkräuselvorrichtung or the like.

The crimped according to the invention Close polyester fibers Fibers obtained by forming polytrimethylene terephthalate polymers with different viscosity to fibers that are side-by-side or eccentric core-shell type be conjugated, heat treating the resulting conjugated fibers and development of crimping, or Fibers produced by asymmetric cooling in a spinning step, heat treatment the resulting fibers and then developing crimping or performed the same become. In this invention, the crimped polyester fibers are particularly preferably the latter fibers where the crimps are asymmetric Cooling developed become. The above ripples cause extraordinary slight disappearance of compression resistance the ripples, even if the fibers are packaged in a ball-like shape, by applying a compression pressure and allowing it to stand for a long time is, in contrast to mechanical ripples, by Stauch with crimping a crimping device or the like, and the processability is excellent, without being able to wind the fibers around cylinders or rolls, Waste fibers, strip breakage and the like comes, even if the fibers then subjected to the carding step.

The Shape of the single fiber cross section of the crimped polyester fibers according to this Invention is not particularly limited, and a circular shape a triangular shape, a flat shape, a hexagonal shape or The like may be according to the purpose suitably chosen become. From the point of view of the easy awarding of asymmetric Birefringence over their diameter in the spinning step and the easy development of the three-dimensional rippling in this invention are the above fibers of preferred hollow fibers, which in particular have a percentage of hollowness of 5 to 80%.

The above-described crimped polyester fibers of the present invention can be produced by, for example, the following method.
A polytrimethylene terephthalate polymer is melted, and a flow of cooling air at a flow rate of 1.0 m / s or above from one side of the filaments after emerging from a spinneret surface at an angle in the range of ± 20 degrees in the direction perpendicular to the forward direction of the filaments the filaments were blown to remove the resulting filaments at 350 to 2500 m / min. Thereby an undrawn yarn having a high level of asymmetric birefringence over the filament diameters in the degree of birefringence is obtained. This undrawn yarn is then drawn at 50 to 95 ° C in hot water 1.2 to 3.5 times, more preferably in two stages, then cut into staple fibers of constant length without performing a heat treatment and at 100 to 150 ° C below heat treated in relaxed conditions. At this time, the flow rate of the cooling air flow can be controlled to 1.0 m / sec or more, thereby imparting the high level of asymmetric birefringence across the filament diameters and easily and advantageously the three-dimensional crimping with a number of crimps of 9 or more develop. From the viewpoint that the spinning performance can be improved thereby and the asymmetric birefringence can be easily imparted across the diameters, the direction of the cooling air flow blown from one side of the filaments is particularly preferably ± 20 degrees in the direction perpendicular to the forward direction the filaments are regulated. As described above, the cut length is preferably in the range of 10 to 100 mm, more preferably in the range of 15 to 90 mm, when the crimped polyester fibers of the present invention are cut into staple fibers. The resulting crimped staple fibers can be carded and the processing required for the particular product can be performed to provide nonwovens, padding, padding materials or the like having good bulk and compression resistance.

For example, the fibrous structure comprising the staple fibers of the crimped polyester fibers according to this invention and the heat-bonding conjugate fibers described below, in a weight ratio of 30:70 to 95: 5, preferably 40:60 to 90:10 and having heat-bonded sites at least partially at contact points of Staple fibers are formed from the crimped polyester fibers with the heat-bonding conjugated staple fibers and / or at points of contact of the heat-bonding conjugate staple fibers with each other, to provide waddings, cushioning materials or the like, which are significantly improved in terms of bulkiness and compression resistance , The fibers constituting the skeleton of the above fiber structure are the above crimped polyester fibers, so that a fiber structure is provided with respect to compression resistance as compared with a conventional fiber structure comprising heat-bonding staple fibers alone or the heat-bonding staple fibers and polyester staple fibers on polyethylene terephthalate fibers. Base is significantly improved.

The above by heat connecting conjugated staple fibers are preferably conjugated Polyester-based fibers obtained by arranging a thermoplastic Polyester-based elastomers (E) and a polyester (P), the one at 10 ° C or more higher Melting point than the elastomer, in an area ratio of E: P of 20:80 to 80:20 obtained in the fiber cross section to at least a part of the Elastomer (E) on the fiber surface to expose. The combination such fibers with the crimped Polyester fibers according to the present invention Invention provides better elasticity and improves compression resistance.

however becomes a polyetherester-based block copolymer which is a polyester as a hard segment and a poly (alkylene oxide) glycol as a soft segment as the above thermoplastic polyester-based elastomer (E) preferred. A polyester containing at least one type of dicarboxylic acid selected from an aromatic dicarboxylic acid, like terephthalic acid, isophthalic acid, Naphthalene-2,6-dicarboxylic acid, Naphthalene-2,7-dicarboxylic acid, Diphenyl-4,4'-dicarboxylic acid, diphenoxyethanedicarboxylic acid or 5-sodium, an alicyclic dicarboxylic acid, such as 1,4-cyclohexanedicarboxylic acid, an aliphatic dicarboxylic acid or the like, such as succinic acid, oxalic acid, adipic acid, sebacic, dodecanoic, or dimer acid, and at least one kind of diol component selected from an aliphatic one Diol, such as ethylene glycol, diethylene glycol, trimethylene glycol, tetramethylene glycol, Pentamethylene glycol, hexamethylene glycol, neopentyl glycol or decamethylene glycol, or an alicyclic diol or the like, such as 1,1-cyclohexanedimethanol or tricyclodecanedimethanol, is exemplified by the above Hard segment listed. One Poly (alkylene oxide) glycol such as polyethylene glycol, poly (1,2-propylene oxide) glycol, Poly (tetramethylene oxide) glycol, poly (trimethylene oxide) glycol, a Copolymer of ethylene oxide and propylene oxide or a copolymer of ethylene oxide and tetrahydrofuran having an average molecular weight from about 400 to 5000 may be termed the soft segment.

Especially For example, the thermoplastic polyester-based elastomer (E) is preferable a polyetherester based block copolymer comprising a hard segment component, which is a polyester which is a major acid component of 40 to 100 Mole% terephthalic acid and 0 to 50 mole percent isophthalic acid and a main one Glycol component of 1,4-butanediol, and a main Soft segment component comprising a poly (alkylene oxide) glycol with a average molecular weight of 400 to 5000, in one copolymerization (Weight ratio) the hard segment component to the soft segment component of 95: 5 to 20:80 wt .-%.

The above thermoplastic polyester-based elastomer (E) has a Melting point in the range of 100 to 210 ° C, more preferably in the range of 130 to 180 ° C. If the melting point is in this range, the occurrence is fusing or bonding fibers together the production of heat connecting conjugated fibers further suppressed and the unevenness the bond in the production of the fiber structure is further suppressed. Further is the intrinsic viscosity of the above in view of spinning property or the like Elastomers (E) preferably 0.6 to 1.7.

on the other hand the polyester (P) may be any of polyethylene terephthalate, Polybutylene terephthalate, polyhexamethylene terephthalate, polytrimethylene terephthalate, Polycyclohexylenedimethylene terephthalate, polypivalolactone or a Copolymer thereof or the like; in terms of elastic However, recovery property of the resulting fiber structure becomes Polytrimethylene terephthalate-based polyester, polybutylene terephthalate-based polyester or polycyclohexylenedimethylene terephthalate-based polyesters are preferred.

The above polyester (P) preferably has a melting point higher by 10 ° C or more than that of the above polyester-based elastomer (E). It may be the same Copolymerisationskompo such as the polyester, which is the hard segment component in the above polyetherester based block copolymer, may be copolymerized if the requirements are met.

The above thermoplastic polyester-based elastomer (E) is in by heat Connecting conjugate fibers according to this invention preferably conjugated with the polyester (P) to give an area ratio E: P of from 20:80 to 80:20 in the fiber cross-section as described above. Of the Conjugated state of components E and P can be any of the known conjugated states such as the eccentric core-shell type, the side-by-side type, the island-in-the-sea type of conjugate spun fibers or the island-in-the-sea type incorporated fibers or mandarin segment type (split) fibers in addition to the core-shell type; however, preferably the components are E and P arranged so that a portion of the elastomer (E) is exposed to the fiber surface and 30% or more of the circumference of the fiber cross section is preferable be taken by the elastomer. Above all, in the case of Side-by-side type and eccentric core-shell type easily a latent crimping ability be lent to easily at the time of heat treatment when molding a Fiber structure fine ripples to update, and therefore are the side-by-side type and the eccentric core-shell type particularly preferred because entangling the fibers increased among themselves and the adhesion can be improved.

The Single fiber fineness of heat Connecting conjugate fibers according to this invention is preferred in the range of 0.5 to 200 dtex, more preferably in the range of 2 to 100 dtex. It is preferable that the single fiber fineness in the above range keep in mind that the number of heat-related Spots formed in the fiber structure when the heat-bonding treatment carried out In order to provide the fiber structure becomes moderate, a sufficient Strength can be obtained and the phenomenon of sticking to the Time of preparation of the heat-bonding conjugated Fibers extraordinarily repressed can be.

Further the shape of the fiber cross section does not have to be a perfect circle, and a polygonal figure, a ribbed figure, a dumpling Shape or the like can be assumed; the shape of the perfect However, circle is preferred by taking the case into account is that the staple fibers formed and through the carding step guided become. One or more hollow parts may also be provided.

The by heat Connecting conjugate fibers of this invention may be incorporated by reference a conventional one known methods are prepared when the above by heat-bonding conjugated fibers are produced.

The cutting length is preferably in the range of 10 to 100 mm, especially preferably in the range of 15 to 95 mm, if the above by heat-bonding conjugated fibers are cut into staple fibers. The carding behavior and the adhesion The fiber structure is particularly good in this area.

The above by heat interconnecting conjugated staple fibers can be crimped to the extent that that no problems occur in the process. Here is the number of ripples preferably in the range of 8 to 20 sheets / 25 mm, and the crimp ratio is preferably in the range of 6 to 18%.

When Process for producing the fiber structure according to this invention from the Staple fibers from the crimped Polyester fibers and by heat Connecting conjugated staple fibers as described above may be conventional ones Procedures are applied when the heat-related sites at least partly at contact points of the staple fibers from the crimped Polyester fibers with heat connect the conjugated staple fibers and / or at contact points by heat connecting conjugated staple fibers with each other inside the fiber structure can be formed by the known methods. For example can Process for blow molding the fibers into a special mold and then heat treating the resulting shaped fibers, method of blowing fiber balls in a special form while the fibers with hotter Air or the like heat treated and the fiber balls and, if necessary, re-implementation of the heat treatment and shapes of the structure or the like are preferably used become.

The Temperature and time for melting only the thermoplastic Polyester-based elastomers (E) can be used as the heat treatment conditions at the time of the above molding. Especially is the Heat treatment temperature preferably about 100 to 210 ° C, and the heat treatment time is preferably about 10 to 30 minutes.

Examples and the like are given below to the structure and the To make effects of the invention more concrete; these examples should however, in no way limit the invention. The respective values in the examples, it was determined by the following methods:

1) intrinsic viscosity

 One Polyethylene terephthalate (PET) and a polytrimethylene terephthalate (PTT) were dissolved in an o-chlorophenol solution at 1.2 g / dl, and a polybutylene terephthalate (PBT) became 0.8 in the o-chlorophenol solution g / dl solved, around each of the intrinsic viscosities at 35 ° C after a conventional Determine the procedure.

2) fineness, fiber length, number of crimps, Percentage of ripples and crimp elastic modulus

The Measurements were made according to the in JIS-L1015 defined procedures.

3) Specific volume, compressibility and recovery rate

The resulting staple fibers were used to make a pile passed a card and measurements were made in accordance with JIS-L1097 defined procedures.

4) carding behavior

Fibers were carded under such conditions that a working speed of the pickup of 35 m / min and a basis weight of the spun ribbon of 50 g / m ^{2 was} provided, and the carding behavior in the operation of the card during 1 hour was evaluated to the results as good to indicate poor and bad.

Evaluation of the fiber structure

5) hardness (Elasticity)

The Measurements were made according to the method defined in JIS-K6401 (5.4). A value of 130 to 200 N was good.

6) Compression residual stress after repeated Compression (resistance)

The Measurements were made according to the method described in JIS-K6401 (5.6). A value of 10% or below was good.

7) hardness unevenness

• 5: ausgezeichnet (außerordentlich gleichmäßig ohne erkannte Ungleichmäßigkeit)
• 4: ausreichend (überwiegend gleichmäßig mit kaum einer Ungleichmäßigkeit)
• 3: gut (keine Sorge trotz teilweise vorhandener Ungleichmäßigkeit)
• 2: dürftig (erkannte Ungleichmäßigkeit)
• 1: sehr schlecht (merkbar viele Ungleichmäßigkeiten)

Ten experts were randomly selected and organoleptic evaluations of unevenness of hardness and softness by touching the surface of each fiber structure with hands were made on the basis of the following criteria:

• 5: excellent (extremely uniform without unevenness detected)
• 4: sufficient (mostly uniform with hardly any unevenness)
• 3: good (do not worry despite partial unevenness)
• 2: poor (detected unevenness)
• 1: very bad (noticeable many irregularities)

[Example 1]

A polytrimethylene terephthalate (having an intrinsic viscosity of 0.85 and a melting point of 225 ° C) was used, melted at 260 ° C, and discharged from a known spinneret having a hollow circular cross section (150 holes) at a throughput of 480 g / min, and cooling air of 25 ° C was blown from one side of the resulting filaments at right angles to the forward direction of the filaments at a flow rate of 1.5 m / sec at a position spaced 1.5 to 15 cm below the spinneret face to obtain an undrawn yarn having a winding speed of 1200 m / min. The resulting undrawn yarn was then formed into a 500,000 dtex cable then 2.46 times by a two-stage hot water drawing process at 70 ° C × 90 ° C stretched. The drawn yarn was crimped with a stuffer box crimper, then cut to a fiber length of 64 mm, and subjected to heat-shrinking treatment at 135 ° C under relaxed conditions to obtain crimped fibers having a percentage density of 15% and helical three-dimensional crimping. The resulting crimped fibers were passed through a card to make a pile which was formed into a futon filling material. Its properties were measured and Table 1 shows the results.

[Examples 2 to 4 and Comparative Examples 1 and 2]

It became a futon stuffing prepared in the same way as in Example 1, except that the number of ripples and the crimp ratio were changed, as shown in Table 1, by changing the flow rate of the cooling air, and the properties were measured. Table 1 shows the results.

Comparative Example 3

One Polyethylene terephthalate (with an intrinsic viscosity of 0.64 and a melting point of 256 ° C) used, at 290 ° C melted and from a known spinneret with a hollow circular cross-section (150 holes) output to provide filaments, and cooling air of 25 ° C was then removed from one side of the resulting filaments at right angles to the forward direction the filaments at a flow rate of 1.5 m / s in a position spaced 1.5 to 15 cm below the spinneret surface on it blown to provide an undrawn yarn at a Winding speed of 1200 m / min. The resulting unstretched Yarn was formed into a 500,000 dtex cable and then 2.40 times in a two-stage hot water drawing process stretched at 70 ° C × 90 ° C. The resulting drawn yarn was crushed using a stuffer box crimper curled, subsequently on a fiber length cut 64 mm and heat-shrink at 135 ° C under relaxed Conditions subjected to ruffled Fibers with a percentage density of 15% and helical three-dimensional ripple provide. The resulting crimped fibers were passed through a card, to make a pile, which then becomes a futon stuffing was formed. Its properties were measured, and the table 1 shows the results.

Comparative Example 4

A futon filling material was prepared in the same manner as in Example 1, except that the cooling air was uniformly blown on the filaments to perform spinning without asymmetric cooling, and an unstretched yarn was obtained. The resulting futon filling material was two-dimensionally crimped by upsetting crimping alone, with no helical three-dimensional crimp in the futon filling material as in Example 1. The properties of this futon filling material were evaluated, and Table 1 shows the results. Table 1 example Comparative example 1 2 3 4 1 2 3 4 (1) PTT PTT PTT PTT PTT PTT PET PTT (2) (3) (3) (3) (3) (3) (3) (3) (4) (5) 1.5 2.0 3.0 4.0 0.5 5.0 1.5 1.5 (6) 12.5 12.2 12.0 11.8 12.0 12.2 12.2 12.0 (7) 9.2 11.5 13.3 18.5 5.2 30.5 9.4 6.3 (8th) 30.5 31.3 34.5 39.4 14.8 52.0 31.2 12.4 (9) 92.3 87.5 89.1 92.4 85.6 93.0 82.4 84.1 (10) 115 117 109 113 121 - 120 128 (11) 52 50 57 56 61 - 68 66 (12) 95 94 93 94 81 - 72 69 (13) Good Good Good Good inadequate bad Good Good

Remarks:

• (1) means "composition".
• (2) means "crimping method (Kräuselgestalt) ".
• (3) means "asymmetric cooling down (Three-dimensional) ".
• (4) means "only stuffer crimping (Two-dimensional) ".
• (5) means "flow velocity the cooling air (M / s) ".
• (6) means "fineness (Dtex) ".
• (7) means "number of ripples (Sheet / 25 mm) ".
• (8) means "crimp ratio (%)".
• (9) means "crimp elastic modulus (%) ".
• (10) means "specific volume (cm ³ / g)".
• (11) means "Compressibility (%)".
• (12) means "recovery rate (%) ".
• (13) means "carding behavior".

[Example 5]

One with a still equipped reaction vessel was 75 parts by weight of dimethyl terephthalate, 25 parts by weight of dimethyl isophthalate, 59 parts by weight of tetramethylene glycol, 71 parts by weight of polytetramethylene glycol (having a molecular weight of 1500) and 0.2 parts by weight of tetrabutoxy titanate charged as a catalyst. Transesterification was carried out at 210 ° C after a usual Method, and the polycondensation reaction was then at 240 ° C performed. To the resulting product was 1 part by weight of Sumilizer GA-80, manufactured by Sumitomo Chemical Co., Ltd., and 1 part by weight Sumilizer TP-D, manufactured by Sumitomo Chemical Co., Ltd., as Antioxidants just before the end of the polycondensation reaction added. The resulting mixture was melt-stirred and then by a conventional method formed into chips to form a polyetherester block copolymer elastomer to provide 40 wt .-% soft segment. The melting point of the thermoplastic elastomer was 130 ° C, and its intrinsic viscosity was 1.15.

The spinning of the resulting thermoplastic elastomer as a sheath component and a polybutylene terephthalate (PBT having an intrinsic viscosity of 0.85 and a melting point of 232 ° C) as a core component was conducted at a rate of 720 g / min using a known spinneret for conjugated fibers from the eccentric core Sheath type (260 holes) to provide a core / sheath fiber area ratio = 60/40, and the resulting filaments were wound at 1100 m / min to obtain an unstretched yarn. The obtained undrawn yarn was then formed into a cable of 500,000 dtex and then stretched 4.4 times in a two-stage hot water drawing process at 70 ° C x 90 ° C. The resulting drawn yarn was coated with a Stauchkräuselvorrich crimped, then subjected to heat-shrinking treatment at 50 ° C under relaxed conditions and then cut to a fiber length of 51 mm to provide heat-bonding conjugated staple fibers. The resulting fibers had a single fiber fineness of 6 dtex, a number of crimps of 11 sheets / 25 mm and a crimp ratio of 8%.

The above heat-bonding conjugated staple fibers were mixed with the polytrimethylene terephthalate fibers in Example 1 in the ratio described in Table 2 and then passed twice through a roller card to provide a composite fiber web which was shaped to provide a constant density and heat-treated in a circulating hot air dryer under conditions of 180 ° C x 15 minutes to obtain a fiber structure having a density of 0.04 g / cm ³ and a thickness of 5 cm. The resulting fiber structure was soft and had good grip. Table 2 shows the results obtained by evaluating the properties of this fibrous structure.

[Examples 6 and 7]

A Fiber composite structure was in the same manner as in Example 5 received, except that the cross sectional area ratio of Component E (sheath) / component P (core) in the heat-bonding conjugated fibers or the mixing ratio of the heat-bonding conjugated staple fibers / polytrimethylene terephthalate staple fibers in the fiber structure as shown in Table 2. The results obtained by evaluating the properties of this fiber structure are shown in Table 2.

[Example 8]

By Heat-bonding Conjugated staple fibers were under the same production conditions obtained as in Example 5, by the core component (P) by Connecting heat conjugated fibers of the polybutylene terephthalate to a polyethylene terephthalate (PET with an intrinsic viscosity of 0.64 and a melting point of 256 ° C). These staple fibers had a single fiber fineness of 12 dtex, a number of crimps of 11 sheets / 25 mm and a crimp ratio of 9%.

A Fiber structure was the same way as in the example 5 received, except that the above through heat connecting conjugated staple fibers instead of the heat-bonding conjugated staple fibers in Example 5, the polybutylene terephthalate as core component (P) were used. The resulting Fiber structure was soft and had a good grip. The table Figure 2 shows the results obtained when evaluating the properties of this Fiber structure were obtained.

Comparative Example 5

A fiber composite structure was obtained in the same manner as in Example 5 except that the polyethylene terephthalate staple fibers in Comparative Example 3 were used in place of the polytrimethylene terephthalate staple fibers in Example 5. The resulting fiber structure had a somewhat harder handle than that in Example 5. Table 2 shows the results obtained by evaluating the properties of this fiber structure. Table 2 units example (1) (2) (3) 5 6 7 8th 5 TA mol% 75 75 75 75 75 IA mol% 25 25 25 25 25 TMG mol% 100 100 100 100 100 (4) mol% 1500 1500 1500 1500 1500 (5) Wt .-% 40 40 40 40 40 (6) ° C 1500 155 155 155 155 (7) polymer PBT PBT PBT PBT PBT (6) 00 232 232 232 256 236 (8th) 40/60 70/30 40/60 40/60 40/60 (9) Good Good Good Good Good (10) PTT PTT PTT PTT PET (11) 70/30 70/30 50/50 70/30 70/30 (12) hardness N 161 153 160 174 209 (13) % 7.1 6.4 6.9 9.3 11.1 (14) Degree 5 5 5 5 4

Remarks:

• (1) means "Comparative Example".
• (2) means "by Heat-bonding Fiber".
• (3) means "component (E) ".
• (4) means "molecular weight from PTMG ".
• (5) means "copolymerization ratio of PTMG ".
• (6) means "melting point".
• (7) means "component (P) ".
• (8) means "sectional area ratio (E) / (P)".
• (9) means "spinning behavior".
• (10) means "curled Polyester fiber ".
• (11) means "weight ratio of crimped polyester fiber / by Heat-bonding Fiber".
• (12) means "property the fiber structure ".
• (13) means "compression residual stress after repeated compression ".
• (14) means "hardness unevenness"

possibility industrial use

The crimped according to the invention Polyester fibers include a polytrimethylene terephthalate based Polyester and have three-dimensional ripples, are in terms of the number of ripples, Crimp ratio and crimp modulus of elasticity balanced. Therefore the carding behavior is due to the synergistic effects improves, and the compression resistance and bulkiness of products, obtained from these fibers are significantly improved. Consequently, you can these polyester fibers are particularly suitable in applications such as nonwovens, Padding or padding materials are used. Especially shows the fiber structure according to the invention, which ruffled the above Polyester fibers used sufficiently properties the ruffled Polyester fibers and has excellent bulk and compression resistance. Therefore, the fiber structure suitable for bedding, furniture, vehicle materials (Upholstery materials, roof lining materials or protective materials), Clothing, filter materials, building / civil engineering materials, agricultural Materials and the like can be used and has high industrial Utility.

Claims (5)

Crimped polyester fibers, characterized by having a polytrimethylene terephthalate-based polyester and having three-dimensional crimp with a number of crimps of 9 to 30 sheets / 25 mm and a crimp ratio of 20 to 50% and further having a crimp elastic modulus of 80% or more, measured by the method as defined in JIS-L1015. curled Polyester fibers according to claim 1, wherein the crimped polyester fibers are hollow fibers with a percentage by volume of 5 to 80%. Fiber structure, characterized in that they are staple fibers from the ruffled Polyester fibers according to claim 1 and heat-bonding conjugate Staple fibers in a weight ratio of the staple fibers the ruffled Polyester fibers to those by heat connecting conjugated staple fibers from 30:70 to 95: 5 and by heat Affiliates has, at least partially, contact points the staple fibers from the crimped Polyester fibers with heat connecting conjugated staple fibers and / or at contact points by heat connecting conjugated staple fibers are formed with each other. The fibrous structure of claim 3, wherein the heat-bonding conjugated staple fibers conjugate fibers based on polyester are by arranging a thermoplastic elastomer on Polyester base (E) and a polyester (P), one at 10 ° C or more higher Melting point than the elastomer, in an area ratio of E: P = 20:80 to 80:20 be formed in the fiber cross section, so that at least a part of Elastomer (E) is exposed to the fiber surface. A fibrous structure according to claim 4, wherein the thermoplastic Polyester-based elastomer (E) A polyetherester-based block copolymer is a hard segment component and a soft segment component in a copolymerization ratio (Weight ratio) the hard segment component to the soft segment component of 95: 5 to 20:80, and wherein the hard segment component is a polyester, the one main acid component from 40 to 100 mole percent terephthalic acid and 0 to 50 mole percent isophthalic acid and a main one Glycol component of 1,4-butanediol, and the soft segment component a poly (alkylene oxide) glycol having an average molecular weight from 400 to 5000 is.